Valve-gear.



H. K. BENTE.

VALVE GEAR.

APPLICATION FILED MAR. 16. m4.

Patented; Nov, 27, 1917/1 l mg m Z SHEETS-SHEET I.

Inventor Witnesses Attorneys r H. K. BENTE.

d NW 27,, 1191?}. I 2 SHEETS-SHEET 2- Pam Attorneys 7 onrrnn staresPATENT HENRY K. BENTE, or snnama, MISSOURI.

VALVE-GEAR.

La iness.

To all whom it may concern;

Be it known that I, HENRY K. BENTE, a citizen of the United States,residing at Sedalia, in the county of Pettis and State of Missouri, haveinvented a new and useful Valve Gear of which the following is aspecification.

The present invention relates to improvements in valve gears, one objectof the in vention being the provision of a valve gear by means of whichat the beginning of each stroke, the valve is rapidly opened and held insuch open position substantially stationary during the introduction andexpansion of the pressure fluid or steam so that the driving piston isproperly operated with the minimum amount of steam to develop themaximum power, the same being cushioned at the end of the stroke by. acertain amount of the retained pressure fluid, so that the piston isoperated in a smooth manner and with practically no lost motion.

A further object of the present invention is the provision of a valvegear, the operat ing member of which is adapted to be connected to themain drive rod so as to have an elliptic movement imparted theretowhereby the valve is operated rapidly to opening or closing position,and retained in either one of said positions substantially stationaryduring the greater movement of the piston so that a maximumpowerisexerted and received from the pressure fluid upon the powerpiston.

A still further object of the present invention is the provision of avalve gear in which the frictional parts are greatly reduced, therebyreducing the power necessary to op crate the same so that the maximumeflicicncy is obtained from the valve gear without any detrimental orimpeding effect upon the power piston.

With the foregoing and other objects in view which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed can be made within thescope of what is claimed without departing from the spirit of theinvention.

In the drawings Figure 1 is a side elevation illustrating a valve gearembodying the present invention;

Patented Nov. 2?, 191"1.

Application filed March 16, 1914. Serial No. 825,016.

Fig. 2 is a detail perspective showing a portion of the structuredepicted in Fig. 1;

Fig. 3 is a fragmental perspective showing a modification;

Figs. 4, 5 and 6 are fragmental side elevations showing the arm inadjusted positions;

Fig. 7 is a transverse section taken through the cross head.

In the drawings, the numeral 100 denotes a cylinder of a locomotiveengine in which operates a piston 102 connected by means of a piston rod105 with a cross head lOl mounted to reciprocate in a cross head guide103. A valve chest 101 is shown, and a valve V operates in the valvechest. A valve rod 50 is connected with the valve V and slides in astandard 19 erected on the cross head guide 103.

As shown in Fig. 7, the cross head 10st carries a. pin 39 on which theforward end of a drive rod 40 is mounted to swing. The forward end ofthe drive rod 4-0 carries adjusting bolts 41 movable for adjustment inarcuate slots 43 formed in a disk 42 constituting a part of an arm asdisposed radially with respect to thepin 39. A primary link 46 ispivoted at to thei ree end of the arm 14:. j

The invention comprises a pair of secondary links 428 and 51 having acommon pivotal connection at 47 with the upper end of the primary link46. The link a8 is pivoted at 49 to the rear end of the valve rod 50. Aplate 5a. is erected on the cross head guide 103 and is provided with acurved slot or guide 53 in which moves, for adjustment, a pin 52 in theforward end of the secondary link 51. The lower end of a link 7 21 ispivotally supported on the pin 52, the upper end of the link 21 beingpivoted to a bell crank 22 fulcrumed on a bracket 106 carried by thecross head guide 103. One end of a rod 23 is pivoted to one arm of thebell crank 22", and the other end of the rod 23" is pivotally connectedwith an operating lever 2 1- hen the bell crank 22 is operated by meansof the rod 23 and the lever 24", the link 21 will be raised and lowered,the pin 52 moving in the slot or guide 53 of the plate 54, and theposition of the secondary link 51, and consequently the position of theprimary link 4:6 being adjusted thereby to regulate the travel of thevalve V. The construction is such that the pivotal connection 15 betweenthe primary link 16 and the arm 44 will describe an ellipse, ashereinbefore mentioned.

In the modification delineated in Fig. 3, the device is characterized bythe fact that two standards 19 support slidably the valve rod 50 asdistinguished from the single standard 19 which supports the valve rod50 in Fig. 1. r

In Figs. 4: and 6 the arm 44 is shown forwardly presented, but arrangedat difierent angles with respect to the drive rod 4L0. In Fig. 5, thearm M is shown rearwardly extended and disposed at an acute angle to thedrive rod 40.

What is claimed is:

1. In a device of the class described, a cylinder; a valve chest; across head guide; a cross head operating in the guide; a piston workingin the cylinder and connected to the cross head; a drive rod; aconnection between the drive rod and the cross head; a radial armmounted to swing for adjustment on the connection and embodying a freeend; means for holding the arm fixed at adjusted angles with respect tothe drive rod; a primary link pivoted to the free end of the arm; a pairof secondary links having a common pivotal connection with the primarylink; a valve operating in the valve chest and pivoted to one of thesecondary links; an auxiliary guide supported on the cross head guide;and an adjusting means under the control of an operator and movable inthe auxiliary guide, the other auxiliary link being pivotally connectedwith the adjusting means.

2. In a device of the class described, a

' cylinder; a valve chest; a piston working in the cylinder; a valveworking in the valve chest; a drive rod operatively conneoted to thepiston; a radial arm mounted Copies of this patent may be obtained forto swing for adjustment on the drive rod and embodying a free end; meansfor holding the arm fixed at adjusted angles with respect to the driverod; a primary link pivoted to the free end of the arm; a pair ofsecondary links pivoted to the primary link, one of the secondary linksbeing pivotal'ly connected to the valve; afixed arcuate guide; and alladjusting means under the control of an operator and movable in theguide from one fixed position to another, the other secondary link beingpivotally connected with the adjusting means.

8. In a device of the class described, a cylinder; a valve chest; across head guide; a cross head operating in the guide; a piston workingin the cylinder and connected to the cross head; a drive rod; aconnection between the drive rod and the cross head; a radial armmounted to swingfor adjust ment on the connection and embodying a freeend; means for holding the arm fixed at adjusted angles with respect tothe drive rod; a primary link pivoted to the free end 7 of the arm; apair of secondary links pivotally connected with the primary link; avalve operating in the valve chest and pivotally connected with oneofthe secondary links ;an adjusting means under the control of an operatorand pivotally connected with the other secondary link; and meanscoacting with said other secondary link for controlling the movementthereof under the action of the adjusting means.

In testimony that I claim the foregoing as my own, I have hereto afiixedmy signa ture in the presence of two witnesses. v

HENRY K. BENTE.

Witnesses:

I. H. FLANDERS,

S, W. JAMES.

five cents each, by addressing the "Commissioner of Patents,

Washington, D. G."

